Hard disk drive and method for managing scratches on a disk of the hard disk drive
a hard disk drive and scratch management technology, applied in the field of hard disk drives and scratch management methods on hard disk drives, can solve the problems of a multi-layered media disk, a defect can be generated on the hdd itself, and the disk itself may develop defects with use, and the likelihood of scratches developing in various directions due to mechanical shock
Inactive Publication Date: 2012-05-01
SEAGATE TECH INT +1
View PDF7 Cites 6 Cited by
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Benefits of technology
Effectively anticipates and manages spiral scratches, ensuring data integrity by skipping potentially defective sectors and enhancing the overall quality of disk storage products.
Problems solved by technology
Unfortunately, a given disk of the HDD itself may develop defects with use, or a defect may inadvertently be generated during manufacture.
For example, during manufacture, a defect can be generated on a multilayered media disk due to scratches occurring as a head stack assembly is loaded on the disk.
Further, as HDD technology evolves to enable HDDs to rotate at higher rpm speeds and / or the TPI (tracks per inch) and BPI (bits per inch) densities increase, the likelihood of scratches developing in various directions due to a mechanical shock (or other factors) increases.
One type of defect highly likely to be generated are scratches running along an oblique line caused by a head that reciprocates while tracing a circular arc on a rotating disk.
Obviously, physical damage, such as scratches, can cause both loss of data and data capacity in a disk.
Since the controllable basic unit of a disk in a HDD is a sector, a scratch that intersects any portion of a sector can result in the loss of the entire sector.
However, the defect detection test is not perfect—generally due to inaccuracies of the actuator head.
Unfortunately, conventional defect detection and predictions technologies do not adequately address spiral scratches running across the surface of a disk or other similar medium.
Thus, it is difficult to perform a scratch fill operation for spiral scratches.
Method used
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View moreImage
Smart Image Click on the blue labels to locate them in the text.
Smart ImageViewing Examples
Examples
Experimental program
Comparison scheme
Effect test
Embodiment Construction
[0029]Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the like elements throughout. The embodiments are described below in order to explain the present invention by referring to the figures.
[0030]FIG. 2 shows an example of a disk 10 having a spiral scratch S. The exemplary spiral scratch S can be generated as the result of an errant trajectory of a read / write head on the disk 10 as the disk 10 spins. While not immediately apparent in FIG. 2, should the disk 10 be linearly mapped from a circular disk to a rectangle, the spiral scratch S will be transformed / mapped from a spiral curve into a continuous oblique line. As such, by obtaining an equation of the continuous oblique line, the spiral scratch S can be modeled for the entirety of the disk 10.
[0031]FIG. 3 is a block diagram of a driving circuit of a hard disk drive using a method for managing scrat...
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More PUM
| Property | Measurement | Unit |
|---|---|---|
| correlation coefficient threshold | aaaaa | aaaaa |
| speed | aaaaa | aaaaa |
| densities | aaaaa | aaaaa |
Login to View More
Abstract
A method for managing scratches on a disk of a hard disk drive is disclosed. By dividing the disk into a plurality of evaluation groups, testing each evaluation group for defects, calculating line equations based on the detected defects and determining whether the defects of the evaluation groups appreciably conform to their respective line equations, scratch fill operations may be appropriately performed using the line equations.
Description
BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to hard disk drives, and a method for managing scratches on hard disk drives[0003]This application claims priority under 35 U.S.C. §119 from Korean Patent Application No. 10-2005-0130803, filed on 27 Dec. 2005, the disclosure of which is hereby incorporated by reference herein as if set forth in its entirety.[0004]2. Description of Related Art[0005]Hard disk drives (HDDs) are memory devices used to record and reproduce data by converting digital electronic pulses to tiny magnetic structures placed on a ferromagnetic medium. Since the HDD can access a large amount of data at high speed, it is widely used as an auxiliary memory device for computer systems.[0006]Unfortunately, a given disk of the HDD itself may develop defects with use, or a defect may inadvertently be generated during manufacture. For example, during manufacture, a defect can be generated on a multilayered media disk due to s...
Claims
the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More Application Information
Patent Timeline
Login to View More Patent Type & AuthorityPatents(United States)
IPC IPC(8): G11B27/36
CPCG11B19/04G11B5/09G11B20/10
InventorJUN, JIN-WAN
OwnerSEAGATE TECH INT